21321200 has 60 divisors (see below), whose sum is σ = 51709488. Its totient is φ = 8448000.

The previous prime is 21321199. The next prime is 21321203. The reversal of 21321200 is 212312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60224 + ... + 60576.

Almost surely, 2^21321200 is an apocalyptic number.

21321200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21321200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25854744).

21321200 is an abundant number, since it is smaller than the sum of its proper divisors (30388288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21321200 is a wasteful number, since it uses less digits than its factorization.

21321200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21321200 is about 4617.4884948422. The cubic root of 21321200 is about 277.2919198722.

Adding to 21321200 its reverse (212312), we get a palindrome (21533512).

The spelling of 21321200 in words is "twenty-one million, three hundred twenty-one thousand, two hundred".